Light-Emitting Panel With Constant-Current Circuit for Power Reduction
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Solution Overview
Problem
Existing display panels face high power consumption due to drive transistors operating in saturation mode, which increases energy usage and heat dissipation, necessitating a reduction in overall power consumption and panel thickness.
Innovation Solution
A light-emitting panel design incorporating a substrate with light-emitting units, switch units, and a constant-current circuit, where the constant-current circuit is connected to data signal lines, allowing for adjustable current output to match varying luminance requirements, eliminating the need for additional drive circuits and simplifying circuit layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive transistors work at saturation area to provide stable current, then light emission stability is improved, but power consumption increases
Solution Approach 1:
The patent extracts the drive transistor from the pixel unit and relocates it to the data signal line. This allows the drive transistor to operate in triode region rather than saturation region, reducing power consumption while maintaining stable current supply through the constant-current circuit connection
Solution Approach 2:
The patent introduces a constant-current circuit as an intermediary between the data signal line and the light-emitting unit. This intermediary ensures stable current supply to the light-emitting unit without requiring the drive transistor to operate in saturation mode, thus resolving the contradiction between stability and power consumption
2Use of energy by moving object
If additional drive circuits are added to reduce power consumption, then power consumption is reduced, but device complexity and panel thickness increase
Solution Approach 1:
The data signal line is given multiple functions: it serves as both a signal transmission line and a current supply line through the constant-current circuit. This multi-functionality eliminates the need for separate drive circuits, reducing device complexity while maintaining power consumption benefits
Solution Approach 2:
The patent merges the drive circuit functionality into the data signal line structure. The drive transistor and constant-current circuit are integrated into the existing data signal line architecture, avoiding additional circuit layers and reducing panel thickness
Data Source
AI summary
Provided are a light-emitting panel, a driving method of a light-emitting panel, and a display device. The display panel includes multiple light-emitting units, multiple first switch units, and a constant-current circuit. The light-emitting units are disposed on one side of a substrate and are arranged in an array along a first direction and a second direction. A first terminal of a light-emitting unit is electrically connected to a first supply voltage terminal. A second terminal of the light-emitting panel is electrically connected to a respective first terminal of a first switch unit. The control terminal of the first switch unit is electrically connected to a scan signal line extending along the first direction. A second terminal of the first switch unit is electrically connected to a data signal line extending along the second direction. An output terminal of the constant-current circuit is electrically connected to the data signal line.